Olive Box
Olive Box Plans Courtesy of Exodus
This is a relatively new box, and all it basically does is serve as a phone
ringer. You have two choices for ringers, a piezoelectric transducer (ringer), or a standard 8 ohm speaker. The speaker has a more pleasant tone to it, but either will do fine. This circuit can also be used in conjunction with a rust box to control an external something or other when the phone rings. Just connect the 8 ohm speaker output to the inputs on the rust box, and control the pot to tune it to light the light (which can be replaced by a relay for external controlling) when the phone rings.
______________
| | ^
NC --|-- 5 4 --|-----/\/\/------->G
| | / R2
G<----)|----|-- 6 3 --|-- NC | C3 | U1 | -------|-- 7 2 --|---------- --- -- - > TO RINGER | | ----|-- 8 1 --|-- | |______________| | | ---///----|(----- L1 | R1 C1 ------------------------------------------ L2
a. Main ringer TTL circuit
(>::::::::::::::::::::::::::::::::::::::::::::::::::::::::<)
_
FROM PIN 2 < - -- --- ----------| |_| |------------->G P1
b. Peizoelectric transducer
(>::::::::::::::::::::::::::::::::::::::::::::::::::::::::<)
__ /|
FROM PIN 2 < - -- --- ---------|(---------. .-------| |/ | >||< |S1| | >||< --| | | >||< | |__|\ | G<---------.>||<.--- | T1 c. Elctro magnetic transducer Parts List
U1 - Texas Instruments TCM1506 T1 - 4000:8 ohm audio transfomer S1 - 8 ohm speaker R1 - 2.2k resistor R2 - External variable resistor; adjusts timing frequency C1 - .47uF capacitor C2 - .1uF capacitor C3 - 10uF capacitor L1 - Tip L2 - Ring L1 and L2 are the phone line.
This is the formula for determining the shift rate:
1 1
SR = --------------------- = ------------ = 6.25 Hz
(DSR(1/f1)+DSR(1/f2)) 128 128
---- + ----
1714 1500
DSR = Shift Devider Rate ratio = 128
f1 = High Output Frequency = 1714
f2 = Low Output Frequency = 1500